Not surprisingly, there are a bunch of racing drivers who also became rotorheads. Dario Franchitti (IRL), Randy Wallace (Nascar), Bill Elliot (Nascar), Eric Smith (Nascar), Bob Bondurant (ex-GT/LM), Eddy Irvine (full-time playboy, occassional ex-F1 driver), Jonathan Palmer (ex-F1), Nigel Mansell (ex-F1), plus the late Graham Hill (F1), Gilles Villeneuve (ex-F1) and Steve Hislop (superbikes), to name but a few.
I/C
p.s. Don't mention Mark Thatcher's interest in helicopters, or you'll get him in trouble.